# Selected to upgrade Thames Water treatment sites

> [Costain](https://voltformer.com/epc-contractors/costain)’s selection concerns water-treatment upgrades; the source distinguishes contractor selection from subsequent project delivery.

- **Source date:** 2026-08-17
- **Original source:** [Costain](https://www.costain.com/news/press-releases/2026/costain-selected-to-upgrade-thames-water-treatment-sites/)
- **Reading time:** 1 min
- **Language:** en
- **URL:** https://voltformer.com/news/costain-2026-08-17-selected-to-upgrade-thames-water-treatment-sites
- **Markdown:** https://voltformer.com/news/costain-2026-08-17-selected-to-upgrade-thames-water-treatment-sites.md

## Reported scope and milestone

Costain: Costain’s selection concerns water-treatment upgrades; the source distinguishes contractor selection from subsequent project delivery.

[Costain](https://www.costain.com/news/press-releases/2026/costain-selected-to-upgrade-thames-water-treatment-sites/)

## Engineering interpretation

Selection is the contractor-appointment stage for treatment-site upgrades. Site-specific design, construction authorization and commissioning remain distinct delivery milestones.

[Costain](https://www.costain.com/news/press-releases/2026/costain-selected-to-upgrade-thames-water-treatment-sites/)

## Delivery responsibilities

The reported construction package defines the contractor’s delivery responsibilities. Civil works, building services, installation and commissioning may sit with different contractors or joint-venture partners. The full project budget is distinct from an individual contractor’s award. Contract award, site mobilization, practical completion and operation are separate milestones; planned dates and capacity remain prospective until the owner confirms delivery. The source-defined scope therefore matters when comparing a civil contractor, a construction manager and an integrated design-and-build provider.

[Costain](https://www.costain.com/news/press-releases/2026/costain-selected-to-upgrade-thames-water-treatment-sites/)

## Related company profiles

- [Costain](https://voltformer.com/epc-contractors/costain) · [Markdown](https://voltformer.com/epc-contractors/costain.md)

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